Insulation Calculator It's sometimes difficult to decide what energy conservation investment will provide the most comfort (and financial return).This spreadsheet should help you see where your heating and air conditioning is going, and will let you compare your upgrade options.nsulation Calculator It's sometimes difficult to decide what energy conservation investment will provide the most comfort (and financial return).
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Consider the pros and cons before you use a tarp. Strengths. 1  Tarps are available in many sizes and are made from a variety of materials. 2  Tarps keep cargo dry. 3  They prevent loose items from blowing out of the truck bed. 4  It's easy to fold tarps neatly for storage.